Stony Batter is a historic defence installation at the northeastern end of Waiheke Island, Auckland, New Zealand. It is sited within a 50-acre scenic reserve of the same name, owned by the New Zealand Department of Conservation (DOC). The park serves double duty as a historical (Category 1 Historic Place) and nature reserve, containing unusual rock formations, three significant bush blocks and three concrete gun emplacements with an extensive tunnel system, reputed to be the largest in New Zealand.